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Pusa 1637
''Pusa'' is a genus of the earless seals, within the family Phocidae. The three species of this genus were split from the genus ''Phoca'', and some sources still give ''Phoca'' as an acceptable synonym for ''Pusa''. The three species in this genus are found in Arctic and subarctic regions, as well as around the Caspian Sea. This includes these countries and regions: Russia, Finland, Scandinavia, Britain, Greenland, Canada, the United States, Iran, Azerbaijan, Kazakhstan, and Japan. Due to changing local environmental conditions, the ringed seals found in the Canadian region has varied patterns of growth. The northern Canadian ringed seals grow slowly to a larger size, while the southern seals grow quickly to a smaller size. Only the Caspian seal species of ''Pusa'' is endangered, while two subspecies of the ringed seal are vulnerable and endangered, Ladoga seal and Saimaa ringed seal The Saimaa ringed seal (''Pusa hispida saimensis'', Finnish: ''saimaannorppa'') is a subsp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baikal Seal
The Baikal seal (''Pusa sibirica''), also known as Lake Baikal seal or Baikal nerpa (), is a species of earless seal endemic to Lake Baikal in Siberia, Russia. The Baikal seal is one of the smallest earless/true seals, and the only exclusively freshwater pinniped species. The related Caspian seal inhabits another large, inland body of water, the Caspian Sea. Both species are closely related to the ringed seal, which inhabits the Arctic Ocean. A subpopulation of inland harbour seals living in the Hudson Bay region of Quebec, Canada (the Lacs des Loups Marins harbour seals), as well as the Saimaa ringed seal and the Ladoga seal (both ringed seal subspecies), are also found in fresh water, but these seals are part of species that also have marine populations, instead of being distinct species. The most recent population estimates are 80,000 to 100,000 animals, roughly equaling the expected carrying capacity of the lake. At present, the species is not considered threatened ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Azerbaijan
Azerbaijan, officially the Republic of Azerbaijan, is a Boundaries between the continents, transcontinental and landlocked country at the boundary of West Asia and Eastern Europe. It is a part of the South Caucasus region and is bounded by the Caspian Sea to the east, Russia's republic of Dagestan to the north, Georgia (country), Georgia to the northwest, Armenia and Turkey to the west, and Iran to the south. Baku is the capital and largest city. The territory of what is now Azerbaijan was ruled first by Caucasian Albania and later by various Persian empires. Until the 19th century, it remained part of Qajar Iran, but the Russo-Persian wars of Russo-Persian War (1804–1813), 1804–1813 and Russo-Persian War (1826–1828), 1826–1828 forced the Qajar Empire to cede its Caucasian territories to the Russian Empire; the treaties of Treaty of Gulistan, Gulistan in 1813 and Treaty of Turkmenchay, Turkmenchay in 1828 defined the border between Russia and Iran. The region north o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caspian Tyulka
Caspian tyulka, ''Clupeonella caspia'', is a species of fish in the family Clupeidae. It is found in the Caspian Sea, also in the lower reaches of the rivers Volga, Ural, and possibly Terek. This is a brackishwater pelagic-neritic The neritic zone (or sublittoral zone) is the relatively shallow part of the ocean above the drop-off of the continental shelf, approximately in depth. From the point of view of marine biology it forms a relatively stable and well-illuminated ... fish, up to 12 cm maximum length. Previously the Caspian tyulka was considered to be a part of the more widespread '' Clupeonella cultriventris'' (subspecies ''C. cultriventris caspia''), but that species is now thought to inhabit the Pontic basin only. References Clupeonella Fish of Asia Fish of Russia Fish of the Caspian Sea Fish described in 1941 {{Clupeiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Caspian Sprat
Southern Caspian sprat, ''Clupeonella grimmi'', is a species of fish in the family Clupeidae. It is found in the brackishwater Caspian Sea, in its central and southern parts in the pelagic The pelagic zone consists of the water column of the open ocean and can be further divided into regions by depth. The word ''pelagic'' is derived . The pelagic zone can be thought of as an imaginary cylinder or water column between the sur ... zone. It is a small fish, typically 11 cm length, and up to 14.5 cm maximum. Occurs not deeper that 32 m depth. Sources ''Clupeonella grimmi'' at FishBase Clupeonella Fish of the Caspian Sea Fish described in 1877 {{Clupeiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clupeonella Engrauliformis
Anchovy sprat, ''Clupeonella engrauliformis'', is a species of fish in the family Clupeidae. It is one of several species of '' Clupeonella'' found in the Central and Southern Caspian Sea. It lives pelagically in the central and southern parts of this brackishwater lake. It is typically long, and up to maximum. It may be found down to a depth of . The achovy sprat was first described by ichthyologist N. A. Borodin in 1904 under the name ''Clupea engrauliformis.'' The holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ... is 124 mm in length, was caught near Cape Buynak in the Caspian Sea and is stored in thZoological Institute of the Russian Academy of Sciences Description The maximum body length is 16.5 cm, with a mass up to 26 g. The body of the fish is elongated a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Gottlieb Gmelin
Samuel George Gottlieb Gmelin (4 July 1744 – 27 July 1774) was a German physician, botanist, and explorer. Background Gmelin was born at Tübingen as part of a well-known family of naturalists. His father was Johann Conrad Gmelin, an apothecary and surgeon. His uncle was Johann Georg Gmelin, who was also uncle to Johann Friedrich Gmelin (the naturalist publisher of the ''Systema Naturae'' of Carolus Linnaeus). Samuel earned his medical degree in 1763 from the University of Leiden at the young age of 18. While living in the Dutch Republic, Gmelin developed a keen interest in marine algae. In 1766 he was appointed professor of botany at St Petersburg. In the following year he was sent on an expedition to study the natural history of the Russian Empire. He explored the rivers Don and Volga, and the western and eastern coasts of the Caspian Sea. Whilst travelling in the Caucasus he was taken hostage by Usmey Khan of Khaïtakes and died of ill treatment in captivity in Akhmedkent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pusa Caspica
The Caspian seal (''Pusa caspica'', syn. ''Phoca caspica'') is one of the smallest members of the earless seal family and unique in that it is found exclusively in the brackish Caspian Sea. It lives along the shorelines, but also on the many rocky islands and floating blocks of ice that dot the Caspian Sea. In winter and cooler parts of the spring and autumn season, it populates the northern Caspian coastline. As the ice melts in the summer and warmer parts of the spring and autumn season, it also occurs in the deltas of the Volga and Ural Rivers, as well as the southern latitudes of the Caspian where the water is cooler due to greater depth. Evidence suggests that the colonization events of Caspian seals were probably facilitated by river connections from the Arctic that have since disappeared, landlocking the populations sometime before the major Pleistocene glaciations. Description Adults are about in length. Males are longer than females at an early age, but females experi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladogram
A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not show how ancestors are related to descendants, nor does it show how much they have changed, so many differing evolutionary trees can be consistent with the same cladogram. A cladogram uses lines that branch off in different directions ending at a clade, a group of organisms with a last common ancestor. There are many shapes of cladograms but they all have lines that branch off from other lines. The lines can be traced back to where they branch off. These branching off points represent a hypothetical ancestor (not an actual entity) which can be inferred to exhibit the traits shared among the terminal taxa above it. This hypothetical ancestor might then provide clues about the order of evolution of various features, adaptation, and other e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caspian Seal
The Caspian seal (''Pusa caspica'', syn. ''Phoca caspica'') is one of the smallest members of the earless seal family and unique in that it is found exclusively in the brackish Caspian Sea. It lives along the shorelines, but also on the many rocky islands and floating blocks of ice that dot the Caspian Sea. In winter and cooler parts of the spring and autumn season, it populates the northern Caspian coastline. As the ice melts in the summer and warmer parts of the spring and autumn season, it also occurs in the deltas of the Volga and Ural Rivers, as well as the southern latitudes of the Caspian where the water is cooler due to greater depth. Evidence suggests that the colonization events of Caspian seals were probably facilitated by river connections from the Arctic that have since disappeared, landlocking the populations sometime before the major Pleistocene glaciations. Description Adults are about in length. Males are longer than females at an early age, but females expe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saimaa Ringed Seal
The Saimaa ringed seal (''Pusa hispida saimensis'', Finnish: ''saimaannorppa'') is a subspecies and glacial relict of ringed seal (''Pusa hispida''). They are among the most endangered seals in the world, having a total population of only about 500 individuals. The only existing population of these seals is found in Lake Saimaa, Finland (hence the name). They have lived in complete isolation from other ringed seal species for around 9,500 years and have diverged into a morphologically and ecologically different subspecies of ringed seal. The population is descended from ringed seals that were separated from the rest when the land rose after the last ice age. This seal, along with the Ladoga seal and the Baikal seal, is one of the few living freshwater seals. Distribution Habitat The Saimaa ringed seal is endemic to their habitat in Lake Saimaa, Finland. The lake lies between the cities of Lappeenranta in the south and Joensuu in the north, spanning an oval of approximat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ladoga Seal
The Ladoga ringed seal (; ''Pusa hispida ladogensis'') is a freshwater subspecies of the ringed seal (''Pusa hispida'') found entirely in Lake Ladoga in northwestern Russia. This pinniped was isolated in freshwater lakes and separated from the Arctic ringed seal as a result of the isostatic rebound of the region following the end of the Weichselian Glaciation. It is related to the even smaller population of Saimaa ringed seals in Lake Saimaa, a lake that flows into Ladoga through the Vuoksi River. Appearance The adult Ladoga seal grows to about 150 cm in length and weighs approximately 60–70 kg. Pups are approximately 50–60 cm at birth and weigh approximately 4–5 kg. There are four variations of coats.Popov, L. "Ladoga Seal." ''Mammals in the Seas, volume II: pinniped species summaries and report on sirenians'' (FAO Fisheries Series) No. 5, Vol II, pp. 70–71 About 47% of Ladoga seals have a dark brown coat with lighter ring shaped patterns, 29% h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vulnerable Species
A vulnerable species is a species which has been Conservation status, categorized by the International Union for Conservation of Nature as being threatened species, threatened with extinction unless the circumstances that are threatened species, threatening its survival and reproduction improve. Vulnerability is mainly caused by habitat loss or destruction of the species' home. Vulnerable habitat or species are monitored and can become increasingly threatened. Some species listed as "vulnerable" may be common in captivity (animal), captivity, an example being the military macaw. In 2012 there were 5,196 animals and 6,789 plants classified as vulnerable, compared with 2,815 and 3,222, respectively, in 1998. Practices such as cryoconservation of animal genetic resources have been enforced in efforts to conserve vulnerable breeds of livestock specifically. Criteria The International Union for Conservation of Nature uses several criteria to enter species in this category. A taxon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
